<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!--  2、为ECharts准备一个具备大小（宽高）的Dom -->
      <div id="main" style="width: 800px;height:400px;"></div>
    </el-card>
  </div>
</template>

<script>
// 1、导入 echarts
import * as echarts from 'echarts';
import _ from 'lodash'

export default {
  data(){
    return{
      // 需要合并的数据
      options: {
          title: {
            text: '用户来源'
          },
          tooltip: {
            trigger: 'axis',
            axisPointer: {
              type: 'cross',
              label: {
                backgroundColor: '#E9EEF3'
              }
            }
          },
          grid: {
            left: '3%',
            right: '4%',
            bottom: '3%',
            containLabel: true
          },
          xAxis: [
            {
              boundaryGap: false
            }
          ],
          yAxis: [
            {
              type: 'value'
            }
          ]
      }
    }
  },
  created(){
    // this.getReportData()
  },
  // 此时，页面上的元素，已经被渲染完毕了
  async mounted(){
    // 3、基于准备好的dom，初始化echarts实例
    var myChart = echarts.init(document.getElementById('main'));

    const { data : res } = await this.$http.get('reports/type/1')
    if(res.meta.status !== 200){
      return this.$message.error('获取报表数据失败')
    }

    // 4、准备数据和配置项
    const result = _.merge(res.data, this.options)

    // 5、展示数据
    myChart.setOption(result)

  },

  methods:{
    // 获取报表数据
    async getReportData(){
      const {data:res} = await this.$http.get('reports/type/1')
      if(res.meta.status !== 200){
        return this.$message.error('获取报表数据失败')
      }
      console.log(res)
    }
  }
}
</script>

<style>

</style>